package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /*
    * 切入点，定义对哪些方法进行增强处理,这里的切入点表达式是针对所有在com.sky.mapper包下的类中的方法，且带有@AutoFill注解的方法进行增强处理
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFillBefore(JoinPoint joinPoint){
        log.info("执行了自动填充操作");
        //获取被拦截的方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //获得方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的AutoFill注解
        OperationType operationType = autoFill.value(); //获得注解上的数据库操作类型
        //获取被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null && args.length == 0){
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        if (operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        //根据不同的操作类型进行赋值

    }

}
